Chevrolet/GMC 2013 DURAMAX Diesel, Owner'S Manual

Page: 15 / 136

Black plate (7,1)
Chevrolet/GMC DURAMAX Diesel - 2013 - CRC - 5/29/12
Instruments and Controls 5-7
This light may also come on when
the Diesel Exhaust Fluid (DEF)
management system is not working.
See
Diesel Exhaust Fluid on
page 9 ‑ 12 .
Malfunctions often are indicated by
the system before any problem is
apparent. Being aware of the light
can prevent more serious damage
to the vehicle. This system also
assists the service technician in
correctly diagnosing any
malfunction.
Notice: If the vehicle is
continually driven with this light
on, the emission controls might
not work as well, the vehicle fuel
economy might not be as good,
and the engine might not run as
smoothly. This could lead to
costly repairs that might not be
covered by the vehicle warranty.
Notice: Modifications made to the
engine, transmission, exhaust,
intake, or fuel system of the
vehicle or the replacement of the
original tires with other than
those of the same Tire
Performance Criteria (TPC) can
affect the vehicle's emission
controls and can cause this light
to come on. Modifications to
these systems could lead to
costly repairs not covered by the
vehicle warranty. This could also
result in a failure to pass a
required Emission Inspection/
Maintenance test. See
Accessories and Modifications on
page 10
‑ 1 .
When the light is on, an emission
control system malfunction has
been detected on the vehicle.
Diagnosis and service might be
required.
An emission system malfunction
might be corrected by using good
quality fuel. Poor fuel quality causes
the engine not to run as efficiently
as designed and may cause: stalling
after start-up, stalling when the
vehicle is changed into gear,
misfiring, hesitation on acceleration,
or stumbling on acceleration. These
conditions might go away once the
engine is warmed up. See
Fuel for
Diesel Engines on page 9 ‑ 19 .
If this does not make the light turn
off, your dealer can check the
vehicle. The dealer has the proper
test equipment and diagnostic tools
to fix any mechanical or electrical
problems that might have
developed.
Emissions Inspection and
Maintenance Programs
Depending on where you live, your
vehicle may be required to
participate in an emission control
system inspection and maintenance
program. For the inspection, the
emission system test equipment will
likely connect to the vehicle's Data
Link Connector (DLC).